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XC888LM Datasheet(PDF) 87 Page - Infineon Technologies AG

Part # XC888LM
Description  8-Bit Single-Chip Microcontroller
PDF  144 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

XC888LM Datasheet(HTML) 87 Page - Infineon Technologies AG

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XC886/888CLM
Functional Description
Data Sheet
80
V0.9, 2006-12
3.10
Watchdog Timer
The Watchdog Timer (WDT) provides a highly reliable and secure way to detect and
recover from software or hardware failures. The WDT is reset at a regular interval that is
predefined by the user. The CPU must service the WDT within this interval to prevent the
WDT from causing an XC886/888 system reset. Hence, routine service of the WDT
confirms that the system is functioning properly. This ensures that an accidental
malfunction of the XC886/888 will be aborted in a user-specified time period.
In debug mode, the WDT is default suspended and stops counting. Therefore, there is
no need to refresh the WDT during debugging.
Features
•
16-bit Watchdog Timer
•
Programmable reload value for upper 8 bits of timer
•
Programmable window boundary
•
Selectable input frequency of
f
PCLK/2 or fPCLK/128
•
Time-out detection with NMI generation and reset prewarning activation (after which
a system reset will be performed)
The WDT is a 16-bit timer incremented by a count rate of
f
PCLK/2 or fPCLK/128. This 16-bit
timer is realized as two concatenated 8-bit timers. The upper 8 bits of the WDT can be
preset to a user-programmable value via a watchdog service access in order to modify
the watchdog expire time period. The lower 8 bits are reset on each service access.
Figure 28 shows the block diagram of the WDT unit.
Figure 28
WDT Block Diagram
WDTREL
MUX
WDT Low Byte
1:2
Clear
WDT
Control
1:128
WDT High Byte
FNMIWDT
WDTIN
f
PCLK
Logic
ENWDT
ENWDT_P
WDTRST
Overflow/Time-out Control &
Window-boundary control
WDTWINB
.



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